Pop-up sink drain with overflow knock-out blank

ABSTRACT

A drain body used to connect a sink drain to drainage pipes for use with sinks having integral overflow protection and sinks with conventional overflow ports. The drain body comprises a hollow cylinder with an upper flange including an upper sidewall portion defining a knock out blank which may be left in place or may be easily removed, thus providing a hole through which the overflow water which is carried through an integral tunnel in the sidewall routed to the bottom drain port of the drain body sinks versus a conventional overflow port. Because sinks having no integral tunnel for draining overflow water require a solid drain body, the user would simply leave the upper sidewall portion intact in order to use the drain with overflow knock-out blank drain body.

CROSS REFERENCES TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional Application Ser. No. 63/231,166 filed on Aug. 9, 2021 which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present invention relates to the field of pop-up drains for sinks.

BACKGROUND OF THE INVENTION

A pop-up drain assembly is a drain with an option to seal the drain to hold water by simply pushing on it to close and to open. Pop-up drains are designed to come in two different options “with overflow” as shown in prior art FIG. 1, 3, and 5 or “without overflow” openings as shown in prior art FIGS. 2 and 4 .

An overflow opening is a small hole drilled in the top of the threaded portion of the drain that allows overflow water from the sink to enter the drain pipe. If the sink features an overflow, it is very important to purchase a drain with an overflow opening so that the sink and drain function properly. If the sink does not feature an overflow hole it needs to be paired with a drain without overflow.

Sinks and wash basins installed and used in bathrooms, kitchens, laundries and so on are always subject to overflow situations in the event that the drain lines become partially or totally clogged. A user may be unaware of the clogged drain or the incoming water may not have been turned off when a user leaves the room. In such an event, the sink will eventually overflow onto the floor and cause damage to the counter or floor.

The overflow in a sink serves two purposes, it diverts water back to the drain pipe and helps prevent water from spilling onto the counter or floor which could result in water damage. While effective, sink overflows are not designed to handle overflowing water. Water will still be rerouted to the drain, but the amount being evacuated likely won't be able to match the quantity filling the basin. Sink overflows also improve draining speed by allowing air into the piping.

Conventional sinks are fitted with overflow protection in the form of a built-in aperture defining a hole in the front or back side of the sink near the top edge of the sink, thus providing a path to drain the water which would otherwise overfill the sink and run out onto the floor. The hole carries the water down through a tunnel molded into the wall of the sink down to the sink drain. The drain pipe or drain body at the bottom of the sink which normally carries the water in the sink out to the sewer pipes in the house or building therefore must include a drain hole which allows the overflow water coming down the tunnel to escape into the same sewer pipes.

Not all sinks are fitted with the overflow holes and molded in tunnels for overflow protection. Designer sinks may be shaped of designed any a variety of configurations with no drain for aesthetic reasons. So, sinks are available in two categories, ones fitted with an extra drain overflow hole or port for at a selected elevation near the top of the sink for overflow water and sinks and bowls which do not include a drain overflow hole for an enhanced appearance.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided a sink drain comprising a longitudinal cylinder having a hollow core. The drain has a lower smooth surface portion, a middle portion with exterior threads, and an upper smooth surface portion terminating with a flange. The longitudinal cylinder has a given general wall thickness of about 3 millimeters, but the knockout blank portion integrally formed in the sidewall of the drain has a thickness of about two millimeters with an even thinner perimeter or seam, sometimes called a breaking of about one to two millimeters, and typically less than two millimeters), to facilitate knocking out the blank forming a clean aperture. The outer surface of the drain sidewall forming the blank body is thinner than the main general drain sidewall thickness which is, for example, about three millimeters. The thinner perimeter provides for easy removal of the sidewall portion, if desired, minimizing risk of damage to the drain conduit.

It is an object of this invention to provide a drain having a drain body which includes a knockout blank or tab for forming an aperture in the sidewall near the upper inlet of the drain which aligns with the overflow outlet of a given sink containing an overflow hole and an integral tunnel through which overflow water drains.

It is an object of this invention to provide a drain which includes a knockout blank or tab which can be used for drains in sinks without overflow drains and sinks which include apertures and therefore require drains having an overflow aperture in the sidewall near the upper inlet of the drain. Leaving the knockout blank intact forms an integral sidewall portion that provides a water tight seal for use in a sink that doesn't have overflow protection, and the integral sidewall portion knockout blank or tab can easily be removed by applying enough pressure against the sidewall portion to cleanly tear away and remove the portion from the drain. Thus the drain in the instant invention can be used for a sink without overflow protection or can be easily modified for use in a sink with built in overflow protection by simply popping the sidewall portion out of the drain.

Other objects, features, and advantages of the invention will be apparent with the following detailed description taken in conjunction with the accompanying drawings showing a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A better understanding of the present invention will be had upon reference to the following description in conjunction with the accompanying drawings in which like numerals refer to like parts throughout the views wherein:

FIG. 1 shows a drain with an overflow;

FIG. 2 shows a drain with no overflow;

FIG. 3 shows a sink with an overflow;

FIG. 4 shows a sink with no overflow;

FIG. 5 is a perspective view of a sink with an overflow drain;

FIG. 6 is a front view of a drain with an overflow inlet which is blocked by an integral knock out blank or knock-out tab;

FIG. 7 is a side view of the drain of FIG. 6 showing the knock out blank;

FIG. 8 is a front view of the upper portion of the drain of FIG. 6 showing the knock out blank;

FIG. 9 is a side view of the upper portion of the drain of FIG. 6 showing the knock out blank having a lower profile to prevent tool movement during removal of the blank and showing the seam around the knockout blank having a thinner thickness than the blank;

FIG. 10 is a side view of the drain showing the break lines of the removable blank portion of the sidewall of the drain of FIG. 6 and showing the wall thickness of the knock out blank wall thickness 0.2 mm versus the drain wall thickness of 0.3 mm with the break lines to facilitate clean removal of the blank from the drain sidewall;

FIG. 11 is a front view of the upper portion of the drain of FIG. 6 showing a tool being pressed against the removable knockout blank portion of the sidewall of the drain to remove the knockout blank;

FIG. 12 is a front view of the upper portion of the drain of FIG. 6 showing the resulting drainage aperture which exists after the knockout blank portion has been removed;

FIG. 13 is a perspective view of the drain having an upper portion showing a knock out aperture after removal of the tab, a medial threaded portion for threadably engaging the nut, and a lower conduct portion;

FIG. 14 is a perspective view of the drain of FIG. 13 including a drain cover having a strainer basket disposed around the stem below the lid for staining fluid entering the drain;

FIG. 13 is a perspective view of the drain of FIG. 10 including a nut and seal affixed thereto and a drain plug having a strainer basket disposed around the stem below the lid for staining fluid entering the drain;

FIG. 14 is a perspective exploded view of the drain tube or “drain conduit” of FIG. 6 , having an upper portion showing a knock out aperture, a medial threaded portion for threadably engaging the nut, and a lower conduct portion, including a strainer basket inserted into the drain tube with the basket showing below the lid cover for staining fluid entering the drain; and

FIG. 15 is a perspective exploded view of the drain tube or “drain conduit” of FIG. 6 , having an upper portion showing a knock out aperture, a medial threaded portion threadably engaging the nut, and a lower conduct portion, including a strainer basket inserted into the drain tube with the basket showing below the lid cover for staining fluid entering the drain.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In accordance with the present invention, there is provided a drain having a knock-out blank providing an drain for use in sink drain assemblies with or without a drain overflow.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.

When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise,” “comprising,” and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to.” Words using the singular or plural number also include the plural or singular number respectively. Additionally, the words “herein,” “above,” “below” and words of similar import, when used in this application, shall refer to this application as a whole and not to any particular portions of this application. When the claims use the word “or” in reference to a list of two or more items, that word covers all of the following interpretations of the word: any of the items in the list, all of the items in the list and any combination of the items in the list

Example embodiments will now be described more fully with reference to the accompanying drawings.

In accordance with the present invention, there is provided a drain which can be used for either a conventional sink with or without overflow protection. Overflow protection in a sink is provided by an overflow opening defining an aperture or hole 5 near to the top of the sink and in the inner sidewall of the sink body leading to a conduit or tunnel within the sink wall which carries the water to the bottom area of the sink. Some sinks may also be cast having an inner and outer shell whereby water flows between the linings to the drain.

The sink 1, shown in FIG. 5 includes a molded-in integral drain tunnel 7 which carries overflow water spilling into the overflow hole 5 of the sink 1. The tunnel 7 resides in the space between the outer wall and the inner wall in the sidewall of the sink. Because this sink contains the overflow prevention comprising a hole 5 in the wall near the top of the sink leading into the tunnel 7 and on to the drain 10, the drain must include a opening requiring plumbers or manufacturers to provide separate kits for sinks with and without overflow holes. If the water level in the sink rises above the overflow hole in the sink, that water will flow through the overflow hole 5 and drain down through the tunnel 7 to the bottom of the sink and through the overflow aperture 14 and out the bottom aperture 11 of the drain 10.

The knockout blank of the instant invention provides a means for providing a single drain which can be easily modified on site to be used in a sealed drain or drain having an overflow port. The sidewall portion defining a knock-out blank or knock-out tab 12 can be removed without special tools by snapping that portion away from the upper sidewall portion 103 of the drain 10. A linear rod or tools such as the shank of a screwdriver can be biased or pressed against the knockout blank which is shaped as a oval or rectangle having rounded corners. Thus removal of the sidewall portion 12 from the drain sidewall 22 can be accomplished by placing a portion of a tool, such as the shaft of a screwdriver 6, against the sidewall portion and pressing the portion 12 into the drain 10 until the portion 12 is broken free from the drain 10.

The knockout blank 12 is integrally formed in the sidewall 22 of the cylindrical drain 10 so that each have a smooth inner wall surface, but the outer exterior surface of the drain blank is recessed inward about 1 millimeter so that the exterior surface of the drain sidewall 22 extends outward further than the knockout blank 12. Thus, the knockout blank 12 has a lower side profile than the drain sidewall 22 as shown best in FIGS. 9 and 10 . The lower profile helps position the tool and prevent it from moving during the procedure to pry open or break the knockout blank away from the sidewall 22 of the drain 10.

The longitudinal cylinder forming the drain sidewall has a given general wall thickness of about 3 millimeters and the knockout blank has a thickness of about two millimeters with an even thinner perimeter or seam (one to two millimeters, and typically less than two millimeters), to facilitate knocking out forming a clean aperture. The blank body should always be thinner than the main general drain wall thickness to provide for easy removal of the sidewall portion, if desired, minimizing risk of damage to the drain conduit.

The sidewall portion 12 is connected to the drain 10 by a thin wall portion 13 around the perimeter of the sidewall portion. It is anticipated that the drain 10 may comprise a thermoplastic or other plastic, or composite material as well as a metallic substance. Where a thermoplastic is used, a general wall thickness may be about two millimeters or more and the thin wall portion may be around three tenths of a millimeter to provide an easily removable sidewall portion which can otherwise be left intact and will provide for water tight fluid drainage. This thin wall connection makes the breaking and removal of the sidewall portion an easy task to perform. The sidewall portion 12 may then be discarded. This provides the drain 10 with an avenue to get rid of overflow water in the sink 1. The overflow water is carried down to the bottom of the sink and drains through the overflow aperture 14 formed in the sidewall 22 of the drain 10 by removal of the knockout blank 12.

The drain 10 comprises a longitudinal cylinder 22 having a hollow core and containing a lower smooth surface portion 101, a middle threaded portion 102, and an upper smooth surface portion 103 terminating with a flange 18. A flange gasket 17 is installed on to the drain 10 just under the flange 18. The drain 10 is inserted downward through the drain hole in the bottom of a sink 1. A rubber washer 16 is then installed onto the drain 10. Next the nut 20 is threaded onto the threaded portion 102 until the nut tightly compresses the rubber gasket 16 and the flange gasket 17 against the sink drain forming a water tight seal.

The overflow aperture 14 is in alignment with the opening of the tunnel 7 at the bottom of the sink 1 and is captured between the flange gasket 17 and the rubber washer 16 so that overflow water is forced to drain out of the tunnel 7, through the overflow aperture 14, and out of the bottom aperture 11 of the drain 10. It is anticipated that the overflow aperture 14 and thus, the sidewall portion 12 is about one quarter inch to three eighths of an inch high by about three to five quarters of an inch wide and is centered about one half inch below the flange 18. Further, a second overflow aperture 14 and sidewall portion 12 may be provide on the opposite side of the drain 10 if desired.

In the event that a user is installing a sink without overflow prevention, that is, there is no overflow aperture in the sink and no drain tunnel 7. In this event there is no need to remove the sidewall portion 12, and, in fact, the sidewall portion 12 must be left intact to prevent any leakage do to the different sink construction.

A drain is shown in FIGS. 12-15 wherein a sidewall portion 12 has been removed and the overflow aperture 14 is left near the flange 18. FIGS. 6-11 show portions of the drain wherein the sidewall portion 12 has not been removed but remains as an integral part of the drain blocking the overflow aperture 14.

FIGS. 14-15 show a drain cover or stopper 9 having a strainer basket 27 disposed around the stem below the lid for staining fluid entering the drain. A nut threadably engages the threaded portion of the drain body whereby the nut secures the drain body against one or more seals provided by o-rings or flexible gasket material provides a watertight seal.

The foregoing detailed description is given primarily for clearness of understanding and no unnecessary limitations are to be understood therefrom, for modification will become obvious to those skilled in the art upon reading this disclosure and may be made upon departing from the spirit of the invention and scope of the appended claims. Accordingly, this invention is not intended to be limited by the specific exemplification presented herein above. Rather, what is intended to be covered is within the spirit and scope of the appended claims. 

We claim:
 1. A sink drain comprising a longitudinal cylinder having a hollow core formed therein, said longitudinal cylinder containing a lower smooth surface portion, a middle portion with exterior threads, and an upper smooth surface portion terminating with a flange, said longitudinal cylinder having a given general wall thickness, said upper smooth surface portion having a removable sidewall knockout blank of a selected thickness less than said drain sidewall and having a perimeter having seam thinner than said knockout blank for easy breakage and removal of said sidewall portion.
 2. The sink drain defined in claim 1 wherein said knockout blank includes an outer exterior surface recessed inward from an exterior surface of said drain sidewall. 